Hair drug testing: Many street drugs (or their breakdown products in the body) are absorbed into the hair. A sample of hair can be tested for recent drug use. Hair analysis: Testing of hair for toxic exposures, such as lead or mercury poisoning.
Gas Water Heater, water not hot enough-Thermostat or Sediment. The dip tube probably disintigrated. The dip tub sends cold water to the bottom of the tank for heating when its heated it rises to the top of the tank. Its possible that the dip tube broke of and now you have cold water mixing with the hot water on top.
Gas supply can cause lots of central heating or boiler breakdowns, especially if you have a payment meter with a card. if you run out of credit, the gas will be switched off. So top-up the credit and re-insert the card. Also, press the gas meter reset button in order to re-establish gas supply to your boiler.